Improvement in pitman-connections



E. MQWHORTER.

. PITMAN communs. No.179,714' Patented July l11, 187e.

nnnnnnnnnn omumoempum, wAsmaroN. D4 c.

UNITED STATES -ELLIS MCWHORTER, OF STERLING, ILLINOIS.

IMPROVEMENT lN PITMAN-CONNECTIONS.

Specification forming part of Letters Patent No. 179,714, dated July 11,1876; application filed February 9, 1876. I

To all whom it may concern Be it known that I, ELLIS McWHoRTER, ofSterling, in the county of Whitesides and State ot Illinois,haveinvented certain new and useful Improvements in Pitman-Connections;and I do hereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art towhich it appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this p 3 and 4 are detached perspective views ofthe parts ofthe same.

A represents the end ot' the pitman proper, which is madewedgc-shaped,as shown in Fig. 2, and provided with two longitudinalslots, a a, for the passage of the fastening and tightening-bolts. Brepresents the crank or wrist-pin to which the pitman is to beconnected. C- is a metal bar or strap bentaround the crank-pin B, andhaving pitman A placed between the two arms ot' said bent bar up againstthe crank-pin, the extreme end of the pitman being'v made concave to fitsaid pin. The bar or strap C is iiexible, so that as the pitman isadjustedv to compensate for wear the bar or strap always tits the pitmanthe entire length of the strap closely, in which re spect this devicediii'ers from all others in use by the advantages gained by the flexiblestrap. The parts A and C are then fastened togetier by bolts D D, whichare passed through holes in the bent bar C, and through the slots a inthe pitman. Nuts G G are then screwed up on the bolts D to tighten theparts firmly together. j

It will readily be seen that when thus fastened the pitman A cannotslip, on account of its wedge form. When, however, the pin or the eye,tbrmed by the bent bar U and concave end of the pin, wears so as to makemore or less lost motion, it is simply necessary to loosen the bolts D,when the pitman A can be moved up against the crank-pin, and thenfastened again fully as secure as before.

This device is intended to be applied at both ends of a pitman formowers, and other similar machines, and mayalso be applied to any otherpitman to take up the lost motion caused by wear.

I am aware that slides the shape of the pitman A, and capable of beingmoved up against thecrank-wrist, have 'been heretofore used, andI do notbroadly claim the pitman A as new. But in like devices heretofore usedthe wear and wastein the journal or crank-wrist could be obviated but onone or, at the most, ou two sides, whilein my invention, by means ot'the combination of the iexible strap C with the pitman A, the partsheilig united closely by the two bolts, the strap G is made to inclosethree sides ofthe wrist B, while the pitman A is adjusted against thefourth or remaining side, thus enwrapping the entire surface ofthe wristB, and compensating the necessary wear around its entire circumt'er`ence by an adjustable surface, inclosing and in contact with such entirecircumference.

Having thus fully described my invention, what l claim as new, anddesire to secure by Letters Patent, is

The wedge-shaped pitman A, having concave end,.and provided with theelongated slots a a, in combination with the flexible bent bar or eye C,bolts D, and nuts Gr, substantially as and for the purposes herein setforth.

In testimony' that I claim the tbregoing as my own, I aix my signaturein presence of two Witnesses.

ELLIS McwHoETEE.

Witnesses:

J. E. MGPHEERAN, El. C. WARD.

